It appears to be a Challenge race rear diffuser....it is no longer in production at this time.

It is not in production at the moment, but it is not discontinued. We've had some problems with the reliability of the supplier on this part so we've had to switch molds and facilities here in the USA on this item a few times due to the complex thin fin design. It's been a long road, but we keep on pushing to get it back out again as we know there are many lusting for it.

It is not in production at the moment, but it is not discontinued. We've had some problems with the reliability of the supplier on this part so we've had to switch molds and facilities here in the USA on this item a few times due to the complex thin fin design. It's been a long road, but we keep on pushing to get it back out again as we know there are many lusting for it.